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Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Within one year, Amortized Cost	$ 1,029
One to five years, Amortized Cost	3,779
Five to ten years, Amortized Cost	6,044
After ten years, Amortized Cost	9,085
Amortized Cost	19,937
Amortized Cost	209,392	$ 219,523
Within one year, Fair Value	1,028
One to five years, Fair Value	3,542
Five to ten years, Fair Value	5,652
After ten years, Fair Value	7,632
Fair Value	17,854
Fair Value	184,585	190,475
Mortgage-backed securities – GSE residential [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	189,455	192,556
Fair Value	$ 166,731	$ 166,236

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